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Exam 3: Data Description

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Question 51

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Given the following data set, find the IQR. 7, 5, 4, 1, 2, 4, 5, 10, 11, 14, 11

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Question 52

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Find the weighted mean for three exams if the first one was worth 75 points and the student received a score of 70%, the second was worth 50 points and the student received a score of 80% and the third was worth 30 points and the student received a score of 95%?

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Question 53

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If the range is divided by 6, an approximate value for the standard deviation is obtained.

The unbiased estimator is included in the formula for calculating the variance of a sample because without it, the computed variance usually underestimates the population variance.

Find , , and for the following data set. 7, 21, 32, 38.

Given the following data set, find the percentile rank for a score of 6. 8, 2, 4, 5, 7, 2, 5, 5, 6

In a class of 200 students, Bill's mark corresponded to a z-score of 1 and Tom's mark corresponded to a z-score of 2.If the distribution of marks was bell-shaped ('normal') than the number of students with a Grade between Bill's mark and Tom's mark is closest to

All the values in a dataset are between 9 and 12, except for one value of 92.That value 92 is likely to be

______________ divide the distribution into four groups, and __________ divide the distribution into ten groups.

Find the mean, mode, median, and midrange value for the following data set. 12, 15, 18, 18, 15, 22, 15, 30, 12

Given the following boxplot where m is the median value, what statement could be made about the distribution of the data?

What is the mean of the following numbers? -12, -9, -5, -4, 0

What is the median of the following numbers? -12, -9, -5, -4, 0

According to Chebyshev's theorem, the proportion of values from a data set that is further than 2 standard deviations from the mean is no more than:

Given the following data set, the IQR is 3. 5, 10, 11, 20, 25, 30

Compute the sample SD for the data set 1, 2, 3.Now construct a symmetrical dataset of 3 values with mean 5 and sample SD equal to 1.

Find the z score for each student and indicate which one has the higher relative score.

If the mean of a set of data is 26.00, and 33.50 has a z-score of 0.75, then the standard deviation must be: